choice of Nash equilibrium algorithm

[shapperzsm]

• [x] definitions of the three two algorithms implemented in Nashpy
• [x] positives and fallbacks / computational complexity of the algorithms
• [x] explanation of the timings carried out
• [x] why support enumeration (and vertex enumeration) were chosen

[shapperzsm]

• [x] examples of two / three player tournaments (work out Nash Eq by hand for example a 'normal tournament & a tournament with a probabilistic ending)